XXV. OBSERVATIONS ON ENDOCLADIA MURI- 

 CATA (P. AND R.) J. AG. 



FLORENCE M. WARNER. 



The collections upon which this paper is based were made at 

 the Minnesota Seaside Station in August, 1902. 



This species was given the same name by two different stu- 

 dents of algag at about the same time. Harvey gave the 

 name Gigartina muricata to a form from San Francisco in 1839 

 or early in 1840 while Postels and Ruprecht gave the same 

 name to a form of the same species in 1840. Harvey describes 

 the plant (Ner. Bor. Am., p. 182, pi. 27, B) as follows : " The 

 frond is formed of a simple, jointed axial filament of large di- 

 ameter, with internodes containing endochrome and about thrice 

 as long as broad, coated externally by a thin stratum of minute 

 cellules, from which radiate to all sides numerous, dichoto- 

 mous, moniliform, horizontal filaments, whose apices, strongly 

 soldered together, unite to form the periphery. The substance 

 is firmly cartilaginous, rigid when dry, Color a very dark 

 brown. Conceptacles spherical, sessile on the ramuli." 



Schmitz and Hauptfleisch in Engler and Prantl's Die natiir- 

 lichen Pflanzenfamilien, describe Endocladia and figure the 

 three-celled carpogonial branch with the auxiliary cell which 

 form the procarp of E. vernicata J. Ag. The thallus, accord- 

 ing to the above, is cylindrical, very much branched on all sides 

 with small hooked spines, and has a distinct filamentous struc- 

 ture. There is a rather thick, long-jointed central axis, with 

 an alternating, inclined, jointed apical cell. This sends off in 

 alternate order dichotomously branched filaments which grow 

 diagonally upwards. These branches are more loosely con- 

 structed and longer jointed toward the center, but toward the 

 cortex become smaller celled and closer, lying finally side by 

 side. The inner layer is more or less quickly traversed with 

 dichotomously branched short-celled rhizoids. The central 

 axis is surrounded by numerous analogous filaments running 

 lengthwise. Gonidia are found in great numbers in the thick- 

 ened branches of certain sections of the thallus. Procarps are 



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